There was a discussion over the weekend regarding the use running an airstone/bubbler full time in your aquarium. The discussion revolved around oxygen/gas exchange and stability of pH. It was suggested a poll was created to determine how many actually utilize an airstone full time in their systems. So, let us know if you do. If you do, let us know if you run it in your display or your sump/refugium. I've added the skimmer as an option as well as there are some skimmers that utilize an airstone. Please feel free to discuss your reasoning for utilizing an airstone in the thread.